CN117590056B - Alternating current-direct current signal isolation detection circuit and detection device - Google Patents
Alternating current-direct current signal isolation detection circuit and detection device Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application provides an AC/DC signal isolation detection circuit, comprising: a frequency dividing module; the input end of the frequency division module is connected with an alternating current/direct current detection signal, and the alternating current/direct current detection signal is subjected to high-low frequency separation and respectively outputs a low-frequency signal and a high-frequency signal; a low frequency isolation module; the low-frequency isolation module is connected with the frequency division module to input a low-frequency signal and output the low-frequency signal after isolation transmission; a high frequency isolation module; the high-frequency isolation module is connected with the frequency division module to input high-frequency signals and output the high-frequency signals after isolation transmission; a mixing module; the frequency mixing module is respectively connected with the low-frequency isolation module and the high-frequency isolation module to input the low-frequency signal and the high-frequency signal which are transmitted in an isolated mode, and the low-frequency signal and the high-frequency signal are mixed to obtain a mixed signal. The problems of signal detection and transmission interference can be avoided, the circuit structure can be simplified while the broadband signal isolation transmission is realized, and the cost of the detection device is reduced.
Description
Technical Field
The application relates to the technical field of signal detection, in particular to an alternating current-direct current signal isolation detection circuit and a detection device.
Background
In the switching power supply, two switching tubes (an upper MOS tube and a lower MOS tube) are alternately conducted, and the upper tube waveform refers to the voltage waveform of the grid electrode of the upper switching tube relative to the source electrode. Such waveforms may be used to analyze the operating state and performance of the circuit. For example, by observing the upper tube waveform, it can be deduced whether the output voltage is stable or not, and whether there is an overcurrent or the like.
As shown in fig. 5, in the circuit schematic diagram of a switching power supply in the prior art, in the driving test of a half bridge or a full bridge of the switching power supply, the upper tube waveform (such as the gate waveform of the MOS transistor Q3 shown in fig. 5) is often difficult to accurately measure, because the measurement reference point is the source of the MOS transistor (such as the V3 measurement point shown in fig. 5), and belongs to a dynamic reference point, which cannot be directly grounded.
In the existing measurement technology, although the differential probe can measure the jumping signal of the reference point, when the differential probe is connected with the grid electrode of the MOS tube to be measured, the signal input lead wire is long, so that antenna effect receiving interference is easy to form, interference is generated on the signal waveform of the grid electrode to be measured, and meanwhile, parasitic capacitance is easy to generate and couple to the grid electrode to be measured, so that inaccurate measurement is caused. In addition, the photoelectric isolation detection can be used for carrying out electric isolation and anti-interference detection and has the characteristic of broadband signal detection, but the current photoelectric isolation detection adopts a mode of converting an electric signal into laser emission after detection, converting a received laser into an electric signal to be input into an oscilloscope after optical fiber transmission, and the whole device has complex structure and higher price.
Disclosure of Invention
In order to solve the problems, the application provides an alternating current-direct current signal isolation detection circuit which can avoid the problems of signal detection and transmission interference by adopting a signal isolation transmission mode, meanwhile, frequency division is carried out on an alternating current-direct current signal to be detected to obtain high-frequency and low-frequency signals, optocoupler isolation transmission is adopted on the low-frequency signals, transformer isolation transmission is adopted on the high-frequency signals, and the circuit structure can be simplified and the cost of a detection device is reduced while broadband signal detection and isolation transmission are realized.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
An ac/dc signal isolation detection circuit comprising:
a frequency dividing module; the input end of the frequency division module is connected with an alternating current/direct current detection signal, and the alternating current/direct current detection signal is subjected to high-low frequency separation and respectively outputs a low-frequency signal and a high-frequency signal;
A low frequency isolation module; the low-frequency isolation module is connected with the frequency division module to input a low-frequency signal and output the low-frequency signal after isolation transmission;
a high frequency isolation module; the high-frequency isolation module is connected with the frequency division module to input high-frequency signals and output the high-frequency signals after isolation transmission;
a mixing module; the frequency mixing module is respectively connected with the low-frequency isolation module and the high-frequency isolation module to input the low-frequency signal and the high-frequency signal which are subjected to isolation transmission, and the low-frequency signal and the high-frequency signal are mixed to obtain a mixed signal.
Further, the frequency division module comprises an amplifier U1 and an amplifier U3; the non-inverting input end of the amplifier U1 is connected with an alternating current/direct current detection signal through a second low-pass filter circuit; a resistor R5 is connected in parallel between the inverting input end and the output end of the amplifier U1; the capacitor C3 and the resistor R4 are also included; the capacitor C3 and the resistor R4 are connected in series and then connected in parallel between the inverting input end and the output end of the amplifier U1; the inverting input end of the amplifier U1 is connected in series with a resistor R3 and then grounded; the output end of the amplifier U1 is connected in series with a resistor R58 and then outputs a low-frequency signal to the low-frequency isolation module; the non-inverting input end of the amplifier U3 is connected with a low-frequency signal through a resistor R12, the inverting input end is connected with an alternating current-direct current detection signal through a resistor R16, and the output end outputs a high-frequency signal to the high-frequency isolation module through a resistor R60; a resistor R13 is connected in parallel between the inverting input terminal and the output terminal of the amplifier U3.
Further, the low-frequency isolation module comprises a first input circuit, a first output circuit and an optocoupler U10; the optocoupler U10 comprises a light emitting diode U10A, a photosensitive diode U10B and a photosensitive diode U10C; the output end of the first input circuit is connected with the light emitting diode U10A, and the input end of the first input circuit is connected with the photosensitive diode U10B; the input end of the first output circuit is connected with the photodiode U10C.
Further, the first input circuit includes a resistor R71, an amplifier U11, a capacitor C26, a resistor R70, a resistor R67, a resistor R64, a transistor Q2, a diode D2, and a resistor R72; the first end of the resistor R71 is connected with a low-frequency signal, and the second end of the resistor R71 is connected with the cathode of the photodiode U10B, the inverting input end of the amplifier U11 and the first end of the capacitor C26, and then connected with a first adjustable voltage; the anode of the photodiode U10B is connected with the non-inverting input end of the amplifier U11; the output end of the amplifier U11 is connected with the second end of the capacitor C26 and the first end of the resistor R70; the second end of the resistor R70 is connected with the first end of the resistor R67 and the base electrode of the triode Q2; the second end of the resistor R67 is connected with the first end of the resistor R64 and then connected with voltage +VCC; the second end of the resistor R64 is connected with the emitter of the triode Q2; the collector electrode of the triode Q2 is connected with the anode of the light-emitting diode U10A, the cathode of the diode D2 and the first end of the resistor R72; the cathode of the light-emitting diode U10A is connected with the anode of the diode D2 and then grounded; the second termination voltage of the resistor R72-VCC.
Further, the first output circuit comprises an amplifier U12, a resistor R66, an adjustable resistor RV6, a capacitor C25 and a resistor R74; a photodiode U10C is connected in parallel in the forward direction between the forward input end and the reverse input end of the amplifier U12; a capacitor C25 is connected in parallel between the inverting input end and the output end of the amplifier U12; the resistor R66 and the adjustable resistor RV6 are connected in series and then connected with the capacitor C25 in parallel; the inverting input end of the amplifier U12 is connected with a second adjustable voltage; the first end of the resistor R74 is connected with the output end of the amplifier U12, and the second end outputs the low-frequency signal after isolation transmission.
Further, the high-frequency isolation module comprises a second input circuit, a transformer TR1, a second output circuit and a frequency cut-off circuit; the transformer TR1 includes an input side TR1A, a first output side TR1B, and a second output side TR1C; the output end of the second input circuit is connected with the input side TR1A, and the input end of the second input circuit is connected with the first output side TR 1B; the frequency-cutting circuit is respectively connected with the input side TR1A and a second input circuit; the second output circuit is connected to the second output side TR 1C.
Further, the second input circuit includes an amplifier U7; the inverting input end of the amplifier U7 is connected in series with a resistor R33 and then connected with a high-frequency signal; a resistor R31 and a capacitor C24 are connected in parallel between the inverting input end and the output end of the amplifier U7; the output end of the amplifier U7 is connected in series with a resistor R34 and then connected to the first end of the input side TR 1A; the second end of the input side TR1A is connected in series with a resistor R38 and then grounded; the non-inverting input end of the amplifier U7 is sequentially connected with a resistor R35 and a resistor R37 in series and then grounded; both ends of the first output side TR1B are coupled in parallel with both ends of the resistor R37.
Further, the frequency cut-off circuit comprises an amplifier U9; the non-inverting input end of the amplifier U9 is connected with the second end of the input side TR1A through a first low-pass filter circuit; a resistor R44 is connected in parallel between the inverting input end and the output end of the amplifier U9; the inverting input end of the amplifier U9 is connected in series with a resistor R45 and then grounded; the output end of the amplifier U9 is connected in series with a resistor R30 and then connected with the inverting input end of the amplifier U7.
Further, the mixing module comprises an amplifier U2; the non-inverting input end of the amplifier U2 is connected in series with a resistor R10 and then connected into the low-frequency isolation module; the non-inverting input end of the amplifier U2 is connected in series with a resistor R7 and then grounded; the inverting input end of the amplifier U2 is connected with a resistor R15 in series and then connected with the high-frequency isolation module; a resistor R8 is connected in parallel between the output end and the inverting input end of the amplifier U2; the mixing module further comprises a resistor R6 and a capacitor C4; the resistor R6 and the capacitor C4 are connected in series and then connected between the output end and the inverting input end of the amplifier U2 in parallel; the high-frequency signal and the low-frequency signal after the isolated transmission are added in the amplifier U2 to obtain a mixed signal, and the mixed signal is output from the output end of the amplifier U2 through a resistor R59.
Further, the second output circuit includes an amplifier U8; the non-inverting input end of the amplifier U8 is sequentially connected with a resistor R36 and a resistor R39 in series and then grounded; the second output side TR1C is connected in parallel with the resistor R39; a capacitor C14 and a resistor R29 are connected in parallel between the inverting input end and the output end of the amplifier U8; the inverting input end of the amplifier U8 is sequentially connected with a resistor R32 and a sliding resistor RV2 in series and then grounded; the output end of the amplifier U8 is connected in series with a resistor R57 and then outputs the high-frequency signal after isolated transmission.
An alternating current-direct current signal isolation detection device comprises the alternating current-direct current signal isolation detection circuit.
The beneficial effects are that:
1. signal detection and transmission interference problems can be avoided by employing a signal isolation transmission mode.
2. The alternating current/direct current signal to be detected is subjected to frequency division to obtain high-frequency and low-frequency signals, the low-frequency signals are transmitted in an optical coupling isolation mode, the high-frequency signals are transmitted in a transformer isolation mode, the circuit structure can be simplified while broadband signal isolation transmission is achieved, and the cost of the detection device is reduced.
R38 is current sampling, R46 and C19 form low-pass filtering, a high-frequency signal obtained through sampling enters an amplifier U9 to be amplified in phase after passing through a first low-pass filtering circuit, and the high-frequency signal is added to an inverting input end of the amplifier U7 through R30 to form negative feedback so as to offset low-frequency components, thereby playing a role in limiting the low-frequency signal and preventing the transformer TR1 from being saturated. In the resistor connected with the amplifier U7, R35 is a matching resistor, and R37 is a load resistor; the TR1B and TR1C parameters are the same; the coil is connected to the U7 non-inverting input end after inverting, thus forming the negative feedback of high-frequency closed-loop control.
4. Compared with an optocoupler device, the transformer TR1 has the characteristics of low delay, good voltage resistance, long service life and the like, is suitable for transmitting high-frequency signals, is mature in technology, is easy to produce and manufacture, and can reduce the whole design and manufacture cost. Meanwhile, the transformer cannot transmit direct current, so that low-frequency signals cannot be transmitted, and the optocoupler is responsible for transmitting direct current and low-frequency signals. The optocoupler has low withstand voltage when in high-frequency signals, so that the optocoupler is only suitable for transmitting low-frequency and direct-current signals.
Drawings
FIG. 1 is a schematic diagram of a module structure of an AC/DC signal isolation detection circuit;
FIG. 2 is a schematic diagram of a circuit structure of an AC/DC signal isolation detection circuit;
FIG. 3 is a schematic circuit diagram of a low frequency isolation module;
FIG. 4 is a schematic circuit diagram of a high frequency isolation module;
FIG. 5 is a schematic diagram of a circuit under test;
Fig. 6 is a schematic circuit diagram of a passive probe.
Detailed Description
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are merely some, but not all embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
Example 1
Fig. 1 to 4 are schematic structural diagrams of an ac/dc signal isolation detection circuit, which includes:
a frequency dividing module; the input end of the frequency division module is connected with an alternating current/direct current detection signal, and the alternating current/direct current detection signal is subjected to high-low frequency separation and respectively outputs a low-frequency signal and a high-frequency signal;
A low frequency isolation module; the low-frequency isolation module is connected with the frequency division module to input a low-frequency signal and output the low-frequency signal after isolation transmission;
a high frequency isolation module; the high-frequency isolation module is connected with the frequency division module to input high-frequency signals and output the high-frequency signals after isolation transmission;
a mixing module; the frequency mixing module is respectively connected with the low-frequency isolation module and the high-frequency isolation module to input the low-frequency signal and the high-frequency signal which are subjected to isolation transmission, and the low-frequency signal and the high-frequency signal are mixed to obtain a mixed signal.
The signal isolation transmission mode is adopted to avoid the problems of signal detection and transmission interference, then the alternating current/direct current signal to be detected is subjected to frequency division to obtain high-frequency and low-frequency signals, the optical coupling isolation transmission is adopted for the low-frequency signals, the transformer isolation transmission is adopted for the high-frequency signals, the circuit structure can be simplified while the broadband signal isolation transmission is realized, and the cost of the detection device is reduced. Furthermore, the frequency dividing module, the low-frequency isolation module, the high-frequency isolation module and the frequency mixing module can be designed on the same circuit board and packaged into an isolation probe structure, signals can be directly input into the oscilloscope after coming out of the frequency mixing module, and the complexity that a transmitting probe, an optical fiber transmission and a receiving conversion probe are needed to be input into the oscilloscope like laser transmission in the prior art is not needed. The whole device has simple structure and low cost, and is more convenient to use and maintain due to no optical fiber line and the like.
In a specific implementation, the frequency division module comprises an amplifier U1 and an amplifier U3; the non-inverting input end of the amplifier U1 is connected with an alternating current/direct current detection signal through a second low-pass filter circuit, namely the non-inverting input end of the amplifier U1 is connected with a pin J1 port 1 shown in fig. 2 through the second low-pass filter circuit; the pin J1 port 1 is used as a detection end and is connected with the grid electrode of the MOS tube to be detected (such as the grid electrode of the MOS tube Q3 shown in fig. 5), the pin J1 port 2 is connected with the source electrode of the MOS tube to be detected (such as the source electrode of the MOS tube Q3 shown in fig. 5), and meanwhile the pin J1 port 2 is grounded to the signal GND1; the signal ground GND1 may be in a floating state, so that the frequency dividing module is an input test of the isolation module and is in a high-voltage floating region as shown in fig. 2; the second low-pass filter circuit comprises a resistor R9 and a capacitor C5, wherein the first end of the resistor R9 is connected with an alternating current/direct current detection signal which is detected and input, the second end of the resistor R9 is connected with the first end of the capacitor C5 and then used as the output end of the second low-pass filter circuit to be connected with the non-inverting input end of the amplifier U1, and the alternating current/direct current detection signal is separated to obtain a low-frequency signal after passing through the second low-pass filter circuit and then enters the non-inverting input end of the amplifier U1 to amplify the signal; a resistor R5 is connected in parallel between the inverting input end and the output end of the amplifier U1; the capacitor C3 and the resistor R4 are also included; the capacitor C3 and the resistor R4 are connected in series and then connected in parallel between the inverting input end and the output end of the amplifier U1, and the resistor R5, the capacitor C3 and the resistor R4 are used for setting the amplification factor of the amplifier U1; the inverting input end of the amplifier U1 is connected in series with a resistor R3 and then grounded; the output end of the amplifier U1 is connected in series with a resistor R58 and then outputs an amplified low-frequency signal to a low-frequency isolation module so as to carry out isolated transmission of the signal; the amplifier U3 is used for performing a signal subtraction function, the non-inverting input end of the amplifier U3 is connected with the low-frequency signal obtained by frequency division through a resistor R12, the inverting input end is connected with an alternating current/direct current detection signal (the alternating current/direct current detection signal comprises a high-frequency signal and a low-frequency signal) through a resistor R16, the alternating current/direct current detection signal obtains a high-frequency signal after the amplifier U3 subtracts the low-frequency signal, and the output end of the amplifier U3 outputs the high-frequency signal to the high-frequency isolation module through a resistor R60; a resistor R13 is connected in parallel between the inverting input end and the output end of the amplifier U3, and a resistor R14 is connected in series with the non-inverting input end of the amplifier U3 and grounded. Furthermore, the non-inverting input end of the amplifier U3 is connected with the low-frequency signal obtained by frequency division through a resistor R12; the first end of the resistor R12 is connected with the non-inverting input end of the amplifier U3, and the second end of the resistor R is connected with the output end of a delay module; the input end of the delay module receives the low-frequency signal output by the resistor R58, and the low-frequency signal input to the amplifier U3 is more accurate through the delay module. In this embodiment, the ac/dc detection signal is low-pass filtered by the resistor R9 and the capacitor C5 to obtain a low-frequency or dc signal, and the low-frequency or dc signal is amplified by the amplifier U1 and then output to the low-frequency isolation module for isolation transmission by the resistor R58. Meanwhile, the alternating current/direct current detection signal enters the amplifier U3 through the inverting input end of the amplifier U3, the low-frequency signal after time delay enters the amplifier U3 from the non-inverting input end of the amplifier U3, the residual high-frequency signal after subtracting the low-frequency signal by the amplifier U3 enters the high-frequency isolation module through the resistor R60, and high-frequency isolation transmission is performed. The function of high and low frequency division transmission of the AC/DC detection signal is realized.
In a specific implementation, the low-frequency isolation module includes a first input circuit, a first output circuit, and an optocoupler U10; the optocoupler U10 comprises a light emitting diode U10A, a photosensitive diode U10B and a photosensitive diode U10C; the input end of the first input circuit is connected with a low-frequency signal output by the frequency dividing module, the output end of the first input circuit is connected with the light emitting diode U10A to drive the light emitting diode U10A to be on or off according to the low-frequency signal, meanwhile, the input end of the first input circuit is also connected with the photosensitive diode U10B, and after the photosensitive diode U10B receives an optical signal emitted by the light emitting diode U10A, the photosensitive diode U10B is conducted or cut off to feed back an electric signal to the input end of the first input circuit, so that feedback closed-loop control of the first input circuit is realized; the input end of the first output circuit is connected with the photodiode U10C, and after the photodiode U10C receives the optical signal sent by the light emitting diode U10A, the photodiode U is turned on or turned off to convert the optical signal into an electric signal and transmit the electric signal to the first output circuit, and the electric signal is output to the mixing module by the first output circuit. The output end of the first input circuit is used for driving the light emitting diode U10A to be on/off so as to transmit low-frequency or direct-current signals; meanwhile, the input end of the first input circuit is connected with the photodiode U10B, and the photodiode U10B is used for receiving the optical signal emitted by the photodiode U10A so as to realize a controlled feedback closed loop; the input end of the first output circuit is connected with the photodiode U10C to receive the signals transmitted through optical coupling isolation.
In a specific implementation, the first input circuit includes a resistor R71, an amplifier U11, a capacitor C26, a resistor R70, a resistor R67, a resistor R64, a triode Q2, a diode D2, and a resistor R72; the first end of the resistor R71 is connected with a low-frequency signal, and the second end of the resistor R71 is connected with the cathode of the photodiode U10B, the inverting input end of the amplifier U11 and the first end of the capacitor C26, and then connected with a first adjustable voltage; the anode of the photodiode U10B is connected with the non-inverting input end of the amplifier U11; the output end of the amplifier U11 is connected with the second end of the capacitor C26 and the first end of the resistor R70; the second end of the resistor R70 is connected with the first end of the resistor R67 and the base electrode of the triode Q2; the second end of the resistor R67 is connected with the first end of the resistor R64 and then connected with voltage +VCC; the second end of the resistor R64 is connected with the emitter of the triode Q2; the collector electrode of the triode Q2 is connected with the anode of the light-emitting diode U10A, the cathode of the diode D2 and the first end of the resistor R72; the cathode of the light-emitting diode U10A is connected with the anode of the diode D2 and then grounded; the second termination voltage of the resistor R72 is VCC (i.e., -2.5V). Further, the first adjustable voltage is output by a first voltage-adjusting circuit, and the first voltage-adjusting circuit comprises a resistor R62, an adjustable resistor RV5, a resistor R63 and a resistor R68; the first end of the resistor R62 is connected with +2.5V voltage, and the second end of the resistor R62 is connected with the first end of the adjustable resistor RV 5; the first end of the resistor R63 is connected with the second end of the adjustable resistor RV5, and the second end of the resistor R63 is connected with-2.5V voltage; the voltage output end of the adjustable resistor RV5 is connected with the first end of the resistor R68; the second terminal of resistor R68 outputs a first adjustable voltage.
In this embodiment, the amplifier U11, the resistor R71, the capacitor C26, the resistor R75, the resistor R76, the capacitor C27, the capacitor C28, the resistor 62, the resistor RV5, the resistor 63, the resistor 68, and the like form a signal control circuit, and the resistor 70, the resistor 67, the resistor 64, the resistor 72, the triode Q2, the diode D2, and the like form a switch circuit, and the signal control circuit controls on/off of the switch circuit according to an input low-frequency signal to control the light emitting intensity of the light emitting diode U10A, so that an electrical signal can be converted into an optical signal to realize photoelectric isolation transmission. The low frequency or direct current signal enters the amplifier U11 for power amplification. When the output end of the amplifier U11 outputs low level, the resistor R67 and the resistor R70 form a voltage dividing circuit, at the moment, the emitter and the base of the triode Q2 are in voltage difference, the triode Q2 is conducted, the forward voltage difference occurs at the two ends of the light emitting diode U10A, and the light emitting diode U10A is bright. When the output end of the amplifier U11 outputs high level, at this time, the emitter and the base of the triode Q2 have no voltage difference, the triode Q2 is cut off, the reverse voltage difference from 0V to-2.5V appears at the two ends of the light emitting diode U10A, and the light emitting diode U10A is not conducted, so that the light emitting diode U10A is not lightened. In summary, by controlling the output level of the amplifier U11, the light emitting diode U10A has 50% brightness when no signal is generated, the brightness increases when a positive signal is generated, and the brightness decreases when a negative signal is generated, thereby realizing the optical isolation transmission of the electrical signal.
In a specific implementation, the first output circuit includes an amplifier U12, a resistor R66, an adjustable resistor RV6, a capacitor C25, and a resistor R74; a photodiode U10C is connected in parallel in the forward direction between the forward input end and the reverse input end of the amplifier U12; a capacitor C25 is connected in parallel between the inverting input end and the output end of the amplifier U12; the resistor R66 and the adjustable resistor RV6 are connected in series and then connected with the capacitor C25 in parallel; the inverting input end of the amplifier U12 is connected with a second adjustable voltage; the first end of the resistor R74 is connected with the output end of the amplifier U12, and the second end outputs the low-frequency signal after isolation transmission. Further, the structure of the second adjustable voltage generating circuit is similar to the second adjustable voltage. After the voltage is set at the inverting input end of the amplifier U12, the photodiode U10C is turned on or off according to the received optical signal to realize photoelectric conversion and input into the amplifier U12, that is, the corresponding low-frequency or direct-current signal transmitted through isolation can be output through the amplifier U12.
In specific implementation, the high-frequency isolation module comprises a second input circuit, a transformer TR1, a second output circuit and a frequency-cutting circuit; the transformer TR1 includes an input side TR1A, a first output side TR1B, and a second output side TR1C; the input end of the second input circuit is connected with the frequency dividing module to receive the high-frequency signal obtained by frequency division; an output end of the second input circuit is connected with the input side TR1A to drive the transformer TR1; the input end of the second input circuit is also connected with the first output side TR1B so as to receive the electric signal after the isolated transmission through the first output side TR1B and realize closed-loop control of high-frequency signal transmission; the frequency-cutting circuit is respectively connected with the input side TR1A and the second input circuit, the frequency-cutting circuit collects the transmitted signals from the input side TR1A, and the signals are filtered to obtain a low-frequency range to be cut off and fed back to the second input circuit so as to control the frequency entering the transformer TR1, and the signals with the too low frequency are prevented from entering the transformer TR1 to cause the saturation of the transformer TR1 and influence the signal transmission; the second output circuit is connected with the second output side TR1C to receive the electric signal after the isolated transmission and output the electric signal to the frequency mixing module. The second input circuit is used for carrying out power amplification on an input high-frequency signal, then driving the transformer TR1 to carry out isolation transmission on the high-frequency signal, and simultaneously carrying out sampling and feedback control on a low-frequency part in the isolation transmission signal through the frequency-cutting circuit so as to limit the low-frequency part signal to enter the transformer TR1 and prevent the transformer TR1 from being saturated. The second output circuit receives the high-frequency signal transmitted in isolation through the second output side TR1C, amplifies the high-frequency signal, and outputs the amplified high-frequency signal.
In a specific implementation, the second input circuit includes an amplifier U7, and the amplifier U7 is used for performing power primary amplification; the inverting input end of the amplifier U7 is connected with a resistor R33 in series and then is connected with a high-frequency signal of the frequency dividing module; a resistor R31 and a capacitor C24 are connected in parallel between the inverting input end and the output end of the amplifier U7; the output end of the amplifier U7 is connected in series with a resistor R34 and then connected to the first end of the input side TR 1A; the second end of the input side TR1A is connected in series with a resistor R38 and then grounded; the non-inverting input end of the amplifier U7 is sequentially connected with a resistor R35 and a resistor R37 in series and then grounded; the two ends of the first output side TR1B are connected in parallel with the two ends of the resistor R37, so that the output signal of the transformer TR1 is fed back to the non-inverting input end of the amplifier U7 to perform high-frequency closed-loop control. Because the transformer TR1 has a start power requirement, the high-frequency signal directly enters the transformer TR1 and cannot drive the isolated transmission of the signal, so that the amplifier U7 is used to perform power primary amplification on the high-frequency signal, then the input side TR1A is driven to perform the isolated transmission of the high-frequency signal, and meanwhile, the feedback signal is received from the first output side TR1B to perform high-frequency closed-loop control.
In a specific implementation, the frequency-cutting circuit comprises an amplifier U9; the non-inverting input end of the amplifier U9 is connected with the second end of the input side TR1A through a first low-pass filter circuit; a resistor R44 is connected in parallel between the inverting input end and the output end of the amplifier U9; the inverting input end of the amplifier U9 is connected in series with a resistor R45 and then grounded; the output end of the amplifier U9 is connected in series with a resistor R30 and then connected with the inverting input end of the amplifier U7. The resistor R38 is used for sampling current, the resistor R46 and the capacitor C19 form a first low-pass filter circuit, a transmission signal flowing through the input side TR1A is collected through the resistor R38 and then enters the first low-pass filter circuit, a low-frequency part signal is obtained and enters the amplifier U9 to be amplified in an in-phase mode, and then the low-frequency part signal is added to the inverting input end of the amplifier U7 through the resistor R30 to form negative feedback so as to offset a low-frequency component clamped in a high-frequency signal, the low-frequency cut-off frequency of the transformer transmission is controlled, and the phenomenon that the transmission of the signal is influenced because the low-frequency signal enters the transformer TR1 is prevented. In the resistors connected with the amplifier U7, a resistor R35 is a matching resistor, and a resistor R37 is a load resistor; the first output side TR1B and the second output side TR1C have the same parameters; the coil is connected to the U7 non-inverting input end after inverting, thus forming the negative feedback of high-frequency closed-loop control. Compared with an optocoupler device, the transformer TR1 has the characteristics of low delay, good voltage resistance, long service life and the like, is suitable for transmitting high-frequency signals, is mature in technology, is easy to produce and manufacture, and can reduce the whole design and manufacture cost. Meanwhile, the transformer cannot transmit direct current, so that low-frequency signals cannot be transmitted, and the optocoupler is responsible for transmitting direct current and low-frequency signals.
In a specific implementation, the second output circuit includes an amplifier U8; the non-inverting input end of the amplifier U8 is sequentially connected with a resistor R36 and a resistor R39 in series and then grounded; the second output side TR1C is connected in parallel with the resistor R39; a capacitor C14 and a resistor R29 are connected in parallel between the inverting input end and the output end of the amplifier U8; the inverting input end of the amplifier U8 is sequentially connected with a resistor R32 and a sliding resistor RV2 in series and then grounded; the output end of the amplifier U8 is connected in series with a resistor R57, and then high-frequency signals after isolation transmission are output to enter the frequency mixing module.
In this embodiment, after the high-frequency signal is subjected to preliminary power amplification by the amplifier U7, the driving transformer performs isolated transmission of the signal, and the high-frequency signal after isolated transmission is amplified by the amplifier U8 and then output to the mixing module. Meanwhile, the high-frequency signal transmitted in an isolated manner is sampled, filtered and amplified by the frequency-cutting circuit to obtain a low-frequency component clamped in the high-frequency signal, and the low-frequency component is fed back to the amplifier U7 for low-frequency limitation so as to control the low-frequency cut-off frequency of the transformer transmission and prevent the transformer from being saturated.
In a specific implementation, the mixing module comprises an amplifier U2; the non-inverting input end of the amplifier U2 is connected in series with a resistor R10 and then connected with a low-frequency signal output by the low-frequency isolation module; the non-inverting input end of the amplifier U2 is simultaneously connected with a resistor R7 in series and then grounded; the inverting input end of the amplifier U2 is connected in series with a resistor R15 and then connected with a high-frequency signal output by the high-frequency isolation module. Meanwhile, a resistor R8 is connected in parallel between the output end and the inverting input end of the amplifier U2. The mixing module further comprises a resistor R6 and a capacitor C4, wherein the resistor R6 and the capacitor C4 are connected in series and then connected between the output end and the inverting input end of the amplifier U2 in parallel. The high-frequency signal and the low-frequency signal after the isolation transmission are added in the amplifier U2 to obtain a mixed signal, the mixed signal is output from the output end of the amplifier U2 to the 1 pin of the J2 port through a resistor R59, the 1 pin of the J2 port can be connected with the signal input end of an oscilloscope, and the 2 pin of the J2 port can be connected with the ground GND of the oscilloscope, so that the output sides of the low-frequency isolation module and the high-frequency isolation module and the mixed module are positioned in a low-voltage area as shown in fig. 2.
In a specific implementation, in the design scheme of the embodiment, the signal input end J1 port in fig. 2 may also be connected to a passive probe circuit as shown in fig. 6 (that is, the J1 port 1 pin is connected to a signal line at one end of the passive probe compensator in fig. 6, and the J1 port 2 pin is connected to a ground line at one end of the passive probe compensator in fig. 6), and the gate signal of the MOS transistor Q3 in fig. 5 enters through the passive probe signal end, and is attenuated before entering the circuit for transmission in the embodiment, so that parasitic capacitance coupled to the circuit to be tested can be further reduced, and antenna effect is reduced.
Example two
An alternating current-direct current signal isolation detection device comprises the alternating current-direct current signal isolation detection circuit.
The application provides an AC/DC signal isolation detection circuit, comprising: a frequency dividing module; the input end of the frequency division module is connected with an alternating current/direct current detection signal, and the alternating current/direct current detection signal is subjected to high-low frequency separation and respectively outputs a low-frequency signal and a high-frequency signal; a low frequency isolation module; the low-frequency isolation module is connected with the frequency division module to input a low-frequency signal and output the low-frequency signal after isolation transmission; a high frequency isolation module; the high-frequency isolation module is connected with the frequency division module to input high-frequency signals and output the high-frequency signals after isolation transmission; a mixing module; the frequency mixing module is respectively connected with the low-frequency isolation module and the high-frequency isolation module to input the low-frequency signal and the high-frequency signal which are subjected to isolation transmission, and the low-frequency signal and the high-frequency signal are mixed to obtain a mixed signal. The signal isolation transmission mode is adopted to avoid the problems of signal detection and transmission interference, then the alternating current/direct current signal to be detected is subjected to frequency division to obtain high-frequency and low-frequency signals, the optical coupling isolation transmission is adopted for the low-frequency signals, the transformer isolation transmission is adopted for the high-frequency signals, the circuit structure can be simplified while the broadband signal isolation transmission is realized, and the cost of the detection device is reduced.
In the description of the present invention, it should be understood that the terms "middle," "length," "upper," "lower," "front," "rear," "vertical," "horizontal," "inner," "outer," "radial," "circumferential," and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
In the present invention, unless expressly stated or limited otherwise, a first feature "on" a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. The meaning of "a plurality of" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The above description is for the purpose of illustrating the embodiments of the present invention and is not to be construed as limiting the invention, but is intended to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. An ac/dc signal isolation detection circuit, comprising:
a frequency dividing module; the input end of the frequency division module is connected with a J1 port 1 pin for transmitting an alternating current/direct current detection signal, a J1 port 2 pin is grounded, the signal ground is in a suspension state, the J1 port 1 pin is connected with the grid electrode of the MOS tube to be tested, the J1 port 2 pin is connected with the source electrode of the MOS tube to be tested, the alternating current/direct current detection signal is subjected to high-frequency and low-frequency separation, and a low-frequency signal and a high-frequency signal are respectively output;
A low frequency isolation module; the low-frequency isolation module is connected with the frequency division module to input a low-frequency signal and output the low-frequency signal after isolation transmission;
a high frequency isolation module; the high-frequency isolation module is connected with the frequency division module to input high-frequency signals and output the high-frequency signals after isolation transmission;
A mixing module; the frequency mixing module is respectively connected with the low-frequency isolation module and the high-frequency isolation module to input the low-frequency signal and the high-frequency signal which are subjected to isolation transmission, and the low-frequency signal and the high-frequency signal are mixed to obtain a frequency mixing signal, the frequency mixing signal is output to a pin J2 port 1, the pin J2 port 1 is connected with the input end of the oscilloscope, and the pin J2 port 2 is connected with the reference ground of the oscilloscope;
The high-frequency isolation module comprises a second input circuit, a transformer TR1, a second output circuit and a frequency cut-off circuit; the transformer TR1 includes an input side TR1A, a first output side TR1B, and a second output side TR1C; the output end of the second input circuit is connected with the input side TR1A, and the input end of the second input circuit is connected with the first output side TR 1B; the second output circuit is connected with the second output side TR1C; the frequency-cutting circuit is respectively connected with the input side TR1A and the second input circuit, acquires a transmitted signal from the input side TR1A, and obtains a low-frequency range to be cut off after filtering and feeds the low-frequency range back to the second input circuit;
The second input circuit includes an amplifier U7; the inverting input end of the amplifier U7 is connected in series with a resistor R33 and then connected with a high-frequency signal; a resistor R31 and a capacitor C24 are connected in parallel between the inverting input end and the output end of the amplifier U7; the output end of the amplifier U7 is connected in series with a resistor R34 and then connected to the first end of the input side TR 1A; the second end of the input side TR1A is connected in series with a resistor R38 and then grounded; the non-inverting input end of the amplifier U7 is sequentially connected with a resistor R35 and a resistor R37 in series and then grounded; the two ends of the first output side TR1B are connected with the two ends of the resistor R37 in parallel, the resistor R35 is matched with the resistor, the resistor R37 is a load resistor, the parameters of the first output side TR1B and the second output side TR1C are the same, and a signal of the first output side TR1B is connected into the non-inverting input end of the amplifier U7 after being subjected to coil inversion;
The frequency-cutting circuit comprises an amplifier U9, wherein the non-inverting input end of the amplifier U9 is connected with the second end of the input side TR1A through a first low-pass filter circuit, and a resistor R44 is connected between the inverting input end and the output end of the amplifier U9 in parallel; the inverting input end of the amplifier U9 is connected in series with a resistor R45 and then grounded; the output end of the amplifier U9 is connected with a resistor R30 in series and then is connected with the inverting input end of the amplifier U7;
the sampling current through the resistor R38 passes through a first low-pass filter circuit formed by the resistor R46 and the capacitor C19, and the obtained low-frequency part signal enters the amplifier U9 to be amplified in phase, and then is added to the inverting input end of the amplifier U7 through the resistor R30 to form negative feedback.
2. The ac/dc signal isolation detection circuit of claim 1, wherein the low frequency isolation module comprises a first input circuit, a first output circuit, and an optocoupler U10; the optocoupler U10 comprises a light emitting diode U10A, a photosensitive diode U10B and a photosensitive diode U10C; the output end of the first input circuit is connected with the light emitting diode U10A, and the input end of the first input circuit is connected with the photosensitive diode U10B; the input end of the first output circuit is connected with the photodiode U10C.
3. The ac/dc signal isolation detection circuit of claim 2, wherein the first input circuit comprises a resistor R71, an amplifier U11, a capacitor C26, a resistor R70, a resistor R67, a resistor R64, a transistor Q2, a diode D2, and a resistor R72; the first end of the resistor R71 is connected with a low-frequency signal, and the second end of the resistor R71 is connected with the cathode of the photodiode U10B, the inverting input end of the amplifier U11 and the first end of the capacitor C26, and then connected with a first adjustable voltage; the anode of the photodiode U10B is connected with the non-inverting input end of the amplifier U11; the output end of the amplifier U11 is connected with the second end of the capacitor C26 and the first end of the resistor R70; the second end of the resistor R70 is connected with the first end of the resistor R67 and the base electrode of the triode Q2; the second end of the resistor R67 is connected with the first end of the resistor R64 and then connected with voltage +VCC; the second end of the resistor R64 is connected with the emitter of the triode Q2; the collector electrode of the triode Q2 is connected with the anode of the light-emitting diode U10A, the cathode of the diode D2 and the first end of the resistor R72; the cathode of the light-emitting diode U10A is connected with the anode of the diode D2 and then grounded; the second termination voltage of the resistor R72-VCC.
4. The ac/dc signal isolation detection circuit of claim 2, wherein said first output circuit comprises an amplifier U12, a resistor R66, an adjustable resistor RV6, a capacitor C25, and a resistor R74; a photodiode U10C is connected in parallel in the forward direction between the forward input end and the reverse input end of the amplifier U12; a capacitor C25 is connected in parallel between the inverting input end and the output end of the amplifier U12; the resistor R66 and the adjustable resistor RV6 are connected in series and then connected with the capacitor C25 in parallel; the inverting input end of the amplifier U12 is connected with a second adjustable voltage; the first end of the resistor R74 is connected with the output end of the amplifier U12, and the second end outputs the low-frequency signal after isolation transmission.
5. An ac/dc signal isolation detection circuit according to claim 1, wherein the second output circuit comprises an amplifier U8; the non-inverting input end of the amplifier U8 is sequentially connected with a resistor R36 and a resistor R39 in series and then grounded; the second output side TR1C is connected in parallel with the resistor R39; a capacitor C14 and a resistor R29 are connected in parallel between the inverting input end and the output end of the amplifier U8; the inverting input end of the amplifier U8 is sequentially connected with a resistor R32 and a sliding resistor RV2 in series and then grounded; the output end of the amplifier U8 is connected in series with a resistor R57 and then outputs the high-frequency signal after isolated transmission.
6. An ac/dc signal isolation detection circuit according to claim 1, wherein the mixing module comprises an amplifier U2; the non-inverting input end of the amplifier U2 is connected in series with a resistor R10 and then connected into the low-frequency isolation module; the non-inverting input end of the amplifier U2 is connected in series with a resistor R7 and then grounded; the inverting input end of the amplifier U2 is connected with a resistor R15 in series and then connected with the high-frequency isolation module; a resistor R8 is connected in parallel between the output end and the inverting input end of the amplifier U2; the mixing module further comprises a resistor R6 and a capacitor C4; the resistor R6 and the capacitor C4 are connected in series and then connected between the output end and the inverting input end of the amplifier U2 in parallel; the high-frequency signal and the low-frequency signal after the isolated transmission are added in the amplifier U2 to obtain a mixed signal, and the mixed signal is output from the output end of the amplifier U2 through a resistor R59.
7. The ac/dc signal isolation detection circuit of claim 1, wherein the frequency division module comprises an amplifier U1 and an amplifier U3; the non-inverting input end of the amplifier U1 is connected with an alternating current/direct current detection signal through a second low-pass filter circuit; a resistor R5 is connected in parallel between the inverting input end and the output end of the amplifier U1; the capacitor C3 and the resistor R4 are also included; the capacitor C3 and the resistor R4 are connected in series and then connected in parallel between the inverting input end and the output end of the amplifier U1; the inverting input end of the amplifier U1 is connected in series with a resistor R3 and then grounded; the output end of the amplifier U1 is connected in series with a resistor R58 and then outputs a low-frequency signal to the low-frequency isolation module; the non-inverting input end of the amplifier U3 is connected with a low-frequency signal through a resistor R12, the inverting input end is connected with an alternating current-direct current detection signal through a resistor R16, and the output end outputs a high-frequency signal to the high-frequency isolation module through a resistor R60; a resistor R13 is connected in parallel between the inverting input terminal and the output terminal of the amplifier U3.
8. An ac/dc signal isolation detection apparatus comprising an ac/dc signal isolation detection circuit as claimed in any one of claims 1 to 7.
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Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1203578A (en) * | 1983-05-20 | 1986-04-22 | Clayton R. Roberts | Mixer for use in a microwave system |
| CN1139213A (en) * | 1995-01-13 | 1997-01-01 | 特克特朗尼克公司 | Split-path linear isolation circuit apparatus and method |
| US5834973A (en) * | 1997-05-01 | 1998-11-10 | Fluke Corporation | Voltage isolation circuit for a measurement channel |
| CN1963538A (en) * | 2006-11-21 | 2007-05-16 | 李君� | Shunt circuit linearity insulating circuit apparatus |
| CN202693656U (en) * | 2012-06-15 | 2013-01-23 | 杭州祺来电子有限公司 | Shunting linear isolation circuit |
| CN103353544A (en) * | 2012-06-15 | 2013-10-16 | 杭州祺来电子有限公司 | Shunt linear isolating circuit device |
| CN103884893A (en) * | 2012-12-20 | 2014-06-25 | 北京普源精电科技有限公司 | Shunt linearity isolation circuit and oscilloscope thereof |
| CN103884887A (en) * | 2012-12-20 | 2014-06-25 | 北京普源精电科技有限公司 | Isolation circuit having Hall element and oscilloscope of isolation circuit |
| CN105045330A (en) * | 2015-06-30 | 2015-11-11 | 富达通科技股份有限公司 | Power supply module in induction type power supply and signal analysis circuit thereof |
| WO2016044497A1 (en) * | 2014-09-19 | 2016-03-24 | Alpha And Omega Semiconductor (Cayman ) Ltd. | Constant on-time (cot) control in isolated converter |
| CN207490878U (en) * | 2017-12-29 | 2018-06-12 | 武汉市乔益师电子有限公司 | A kind of amplitude limit low-frequency amplifier circuit |
| CN109728787A (en) * | 2019-01-29 | 2019-05-07 | 王齐祥 | A kind of power amplifier |
| CN209313739U (en) * | 2018-10-31 | 2019-08-27 | 南京熊猫电子股份有限公司 | A kind of high-frequency isolation type ac-dc conversion circuit |
| CN110542774A (en) * | 2019-09-11 | 2019-12-06 | 深圳市航天新源科技有限公司 | Feedback type bidirectional current magnetic isolation sampling circuit |
| CN210608940U (en) * | 2019-12-05 | 2020-05-22 | 大连海伏科技有限公司 | High-voltage power supply converter with high isolation voltage |
| CN114710040A (en) * | 2022-05-19 | 2022-07-05 | 东莞市石龙富华电子有限公司 | Magnetic saturation control system of low-power transformer |
| CN116953309A (en) * | 2023-09-18 | 2023-10-27 | 深圳市鼎阳科技股份有限公司 | Power supply probe of oscilloscope and oscilloscope |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2974909B1 (en) * | 2011-05-02 | 2013-05-31 | Chauvin Arnoux | GALVANIC INSULATION DEVICE |
-
2024
- 2024-01-15 CN CN202410053256.2A patent/CN117590056B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1203578A (en) * | 1983-05-20 | 1986-04-22 | Clayton R. Roberts | Mixer for use in a microwave system |
| CN1139213A (en) * | 1995-01-13 | 1997-01-01 | 特克特朗尼克公司 | Split-path linear isolation circuit apparatus and method |
| US5834973A (en) * | 1997-05-01 | 1998-11-10 | Fluke Corporation | Voltage isolation circuit for a measurement channel |
| CN1963538A (en) * | 2006-11-21 | 2007-05-16 | 李君� | Shunt circuit linearity insulating circuit apparatus |
| CN202693656U (en) * | 2012-06-15 | 2013-01-23 | 杭州祺来电子有限公司 | Shunting linear isolation circuit |
| CN103353544A (en) * | 2012-06-15 | 2013-10-16 | 杭州祺来电子有限公司 | Shunt linear isolating circuit device |
| CN103884893A (en) * | 2012-12-20 | 2014-06-25 | 北京普源精电科技有限公司 | Shunt linearity isolation circuit and oscilloscope thereof |
| CN103884887A (en) * | 2012-12-20 | 2014-06-25 | 北京普源精电科技有限公司 | Isolation circuit having Hall element and oscilloscope of isolation circuit |
| WO2016044497A1 (en) * | 2014-09-19 | 2016-03-24 | Alpha And Omega Semiconductor (Cayman ) Ltd. | Constant on-time (cot) control in isolated converter |
| CN105045330A (en) * | 2015-06-30 | 2015-11-11 | 富达通科技股份有限公司 | Power supply module in induction type power supply and signal analysis circuit thereof |
| CN207490878U (en) * | 2017-12-29 | 2018-06-12 | 武汉市乔益师电子有限公司 | A kind of amplitude limit low-frequency amplifier circuit |
| CN209313739U (en) * | 2018-10-31 | 2019-08-27 | 南京熊猫电子股份有限公司 | A kind of high-frequency isolation type ac-dc conversion circuit |
| CN109728787A (en) * | 2019-01-29 | 2019-05-07 | 王齐祥 | A kind of power amplifier |
| CN110542774A (en) * | 2019-09-11 | 2019-12-06 | 深圳市航天新源科技有限公司 | Feedback type bidirectional current magnetic isolation sampling circuit |
| CN210608940U (en) * | 2019-12-05 | 2020-05-22 | 大连海伏科技有限公司 | High-voltage power supply converter with high isolation voltage |
| CN114710040A (en) * | 2022-05-19 | 2022-07-05 | 东莞市石龙富华电子有限公司 | Magnetic saturation control system of low-power transformer |
| CN116953309A (en) * | 2023-09-18 | 2023-10-27 | 深圳市鼎阳科技股份有限公司 | Power supply probe of oscilloscope and oscilloscope |
Non-Patent Citations (4)
| Title |
|---|
| 300MHz 手持示波表隔离通道设计;周颖;中国优秀硕士学位论文全文数据库工程科技Ⅱ辑;20170215(第02期);第11页，第15-31页 * |
| 光伏并网逆变器中工频变压器的磁饱和抑制;曾汉超 等;电力电子技术;20180930;第52卷(第9期);第89-91页 * |
| 周颖.300MHz 手持示波表隔离通道设计.中国优秀硕士学位论文全文数据库工程科技Ⅱ辑.2017,(第02期),第11页，第15-31页. * |
| 数字存储示波器通道隔离系统的设计;秦亮;中国优秀硕士学位论文全文数据库工程科技Ⅱ辑;20130715(第07期);第28-31页 * |
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